Oil Pressure and Oil Pressure Switch, Checking

Oil Pressure and Oil Pressure Switch, Checking

Special tools, testers and auxiliary items required

• Oil Pressure Gauge (V.A.G 1342)

• Voltage Tester (V.A.G 1527 B)

• Connector Test Kit (V.A.G 1594 C)

Test Prerequisites

• Engine oil level OK.

• The oil pressure warning lamp must light up for approximately 3 seconds when the ignition is switched on.

• On vehicles with auto-check-system, the indicator "OK" must light up (check symbol).

• Engine oil temperature at least 80 °C (176 °F) (radiator fan must start up once).

• Function test and servicing the optical and acoustic oil pressure indicator: Wiring diagrams, "Function and Component Selection".

Test Sequence

• For the correct tightening specifications, refer to => [ Oil Filter Bracket Overview ] Oil Filter Bracket Overview

- Remove oil pressure switch (F1) - A - and screw it into oil pressure gauge.






- Thread oil pressure gauge into oil filter bracket in place of oil pressure switch.

- Connect the tester brown wire to Ground (GND).

- Connect (V.A.G 1527 B) using adapter cables from (V.A.G 1594 C) to battery B positive and oil pressure switch - B -. LED must not light up.

- If LED lights up, replace 1.4 bar oil pressure switch.

If the LED does not light up:

- Start engine and increase engine speed: LED must light up at 1.2 to 1.6 bar positive pressure, otherwise replace oil pressure switch. Increase engine speed further. At 2000 RPM and an oil temperature of 80 °C (176 °F), the oil pressure should be between 2.7 bar and 4.5 bar.